薛翔, 胡少伟, 齐浩, 单常喜. 钢-混凝土交界面法向粘结性能研究[J]. 工程力学, 2022, 39(5): 65-74. DOI: 10.6052/j.issn.1000-4750.2021.03.0182
引用本文: 薛翔, 胡少伟, 齐浩, 单常喜. 钢-混凝土交界面法向粘结性能研究[J]. 工程力学, 2022, 39(5): 65-74. DOI: 10.6052/j.issn.1000-4750.2021.03.0182
XUE Xiang, HU Shao-wei, QI Hao, SHAN Chang-xi. STUDY ON THE NORMAL BONDING PERFORMANCE OF THE STEEL-CONCRETE INTERFACE[J]. Engineering Mechanics, 2022, 39(5): 65-74. DOI: 10.6052/j.issn.1000-4750.2021.03.0182
Citation: XUE Xiang, HU Shao-wei, QI Hao, SHAN Chang-xi. STUDY ON THE NORMAL BONDING PERFORMANCE OF THE STEEL-CONCRETE INTERFACE[J]. Engineering Mechanics, 2022, 39(5): 65-74. DOI: 10.6052/j.issn.1000-4750.2021.03.0182

钢-混凝土交界面法向粘结性能研究

STUDY ON THE NORMAL BONDING PERFORMANCE OF THE STEEL-CONCRETE INTERFACE

  • 摘要: 考虑到钢-混凝土交界面的特殊性,提出了三个用于评价交界面法向粘结性能的参数指标,包括法向粘结刚度、法向粘结强度和法向极限张开位移,使用断裂力学理论推导了参数的计算方法,设计并进行了钢-混凝土交界面法向粘结参数测定试验。试验结果表明:在交界面粘结力的作用下,试验荷载-裂缝口张开位移(P-CMOD)曲线初始上升段会经历线性段、过渡段和平台段三个阶段;随着钢板粗糙度的增加,交界面法向粘结强度的增幅要远大于法向粘结刚度和法向极限张开位移的增幅;单位粗糙度交界面各个法向粘结性能参数的增量随着钢板粗糙度的增加而减小,其中法向极限张开位移值的增量降低最多;在钢板足够粗糙的情况下,交界面的法向粘结性能应趋近于交界面处砂浆的力学性能。将理论计算结果与有限元分析结果进行对比,两者吻合度很好,表明理论分析方法和试验方法的正确性,计算得到的交界面法向粘结参数值可用于实际工程分析。

     

    Abstract: Considering the particularity of the steel-concrete interface, three parameters for evaluating the normal bonding performance of the interface are proposed, including normal bonding stiffness, normal bonding strength and normal limit opening displacement. The calculation method of the parameters is derived by using the fracture mechanics theory, and the determination test of the normal bonding parameters of the steel-concrete interface is designed and implemented. The test results show that: under the effect of the interface bonding force, the initial rising section of the test load-crack mouth opening displacement (P-CMOD) curve experiences three stages: linear segment, transitional segment and platform segment; with the increase of steel plate roughness, the amplification of interface normal bonding strength is much larger than that of normal bonding stiffness and of normal limit opening displacement; the increment of each interface normal bonding performance parameter per unit roughness decreases with the increase of steel plate roughness, and the decrease of the increment of normal limit opening displacement is the biggest; when the steel plate roughness is plenty big enough, the normal bonding performance of the interface will be close to the mechanical properties of mortar in the interface. The comparison between the theoretical calculation results and the finite element analysis ones shows that the two results are in a good agreement, which indicates that both the theoretical analysis method and the test one are correct, and the normal bonding parameters of the interface calculated from the test can be used for the associated practical engineering analysis.

     

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